A steep and rewarding 6.2 mile out and back route form the campsite at Cwmdu to Pen Cerrig Calch, a 701m Hewitt or Nuttall (hill).
The route leaves the campsite and climbs, through and interesting farm with a resident stone mason, and up onto the open land of the hill itself. A steep climb up the escarpment brings you to Pen Gloch-y-pibwr and a large stone cairn. From here the ridge can be followed all the way to the summit.
Looking northwards, you can see Pen Allt-mawr, a touch higher at 719m.
